Is they a demonstrative or personal pronoun?

The pronoun 'they' is a personal pronoun.

A personal pronoun takes the place of a noun for specific people or things.

The personal pronouns are: I, you, we, he, she, it, me, us, him, her, they, them.

A demonstrative pronoun takes the place of a noun, indicating near or far in place or time.

The demonstrative pronouns are: this, that, these, those.

Examples:

The Tylers came to visit and they brought the baby with them. (the personal pronouns 'they' and 'them' take the place of the noun 'Tylers')

I would like six of these and a two of those. (the demonstrative pronouns 'these' and 'those' indicate which of what is offered I would like)

Note: The demonstrative pronouns function as adjectives when place before a noun to describe that noun.

Example: I would like six of these cupcakes.